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Design of nonlinear controller based on ADAR method for wedge balancing
Chiem Nguyen Xuan,Le Tran Thang 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
In this article, the author presented the application of principles and ADAR methods in synergetic control theory to synthesize an inverted wedge-balanced stable controller. Synergetic control theory is based on the principle of self-organization through invariant, asymptotically stable. In this method, the control law was synthesized to ensure the motion of the closed-loop control object from an arbitrary initial state into the vicinity of the desired gravitational invariant manifold. To synthesize the control law were presented in the article step by step. The control quality of the system was determined through manifolds. The quality and effectiveness of this control law are demonstrated by the control quality criteria, which are response time and overshoot in simulation results and compared with the LQR control law.
Chiem, Chu Van,Seo, Hyung-Kee,Ansari, Shafeeque G.,Kim, Gil-Sung,Seo, Jae Myung,Shin, Hyung-Shik 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.6
In this paper, the growth of Lonsdaleite diamond using hot-filament chemical vapor deposition (HFCVD) on flashed and reconstructed Si (100) is reported. Surface morphology studies using scanning electron microscopy (SEMI show that the film is composed of decahedron and icosahedron diamond particles. The X-ray -tion (XRD) pattern has a strongest peak at 47° and a peak at 41°. which is indicative of Lonsdaleite name of the grown diamond film. The Raman spectrum of the film shows a broadened diamond peak at wave number of 1,329 ㎝^(-1), which has shifted towards the peak position corresponding to Lonsdaleite nahxe of the diamond (1,326 ㎝^(-1)).
신형식,김영순,강길선,Mushtaq Ahmad Dar,Shafeeque G. Ansari,Hyung-il Kim,Chu Van Chiem 한국화학공학회 2005 Korean Journal of Chemical Engineering Vol.22 No.5
Diamond films on the p-type Si(111) and p- type(100) substrates were prepared by microwave plasma chemical vapor deposition (MWCVD) and hot-filament chemical vapor deposition (HFCVD) by using a mixture of methane CH4 and hydrogen H2 as gas feed. The structure and composition of the films have been investigated by Xray Diffraction, Raman Spectroscopy and Scanning Electron Microscopy methods. A high quality diamond crystalline structure of the obtained films by using HFCVD method was confirmed by clear XRD-pattern. SEM images show that the prepared films are polycrystalline diamond films consisting of diamond single crystallites (111)-orientation perpendicular to the substrate. Diamond films grown on silicon substrates by using HFCVD show good quality diamond and fewer non-diamond components.